app/ui/groups/table.tsx

@@ -35,7 +35,6 @@ export default function GroupsTable({ groups, onUpdate, onEdit, onEditAffinities
     return acc;
   }, new Map());
 
-  groups.forEach(group => group.children = []);
   groups.forEach(group => {
     if (group.parentId) {
       const parent = index.get(group.parentId);